Phytochemicals are the mainstay of therapeutics of herbal or botanical medicine. Research on phytomolecules is conducted worldwide and several have been screened for clinical trials, including promising anticancer agents withaferin-a and camphothecin. This book provides a scientific understanding of the mode of action of these molecules, targeting only those phytohemicals and herbal extracts that are subjects of recent pharmacological investigations. Chapters such as industrial crops for steroid manufacturing and anticancer potential of sesquiterpenoids make readers eager to learn more about the commercial viability of phytochemical and herbal extracts.